<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .title {
            color: red;
        }
    </style>
</head>

<body>
    <!DOCTYPE html>
    <html lang="en">

    <head>
        <title>Hello World</title>
    </head>

    <body>
        <div id="root"></div>
        <script src="./sdk/react.development.js"></script>
        <script src="./sdk/react-dom.development.js"></script>
        <script src="./sdk/babel.min.js"></script>
        <script type="text/babel">
            class Root extends React.Component {
                style = { width: '100px', height: '100px', backgroundColor: 'red' }
                render() {
                    return (
                        <div>
                            <div style={this.style}></div>
                        </div>
                    )
                }
            }
            ReactDOM.render(
                <Root />,
                document.getElementById('root')
            );
        </script>
    </body>

    </html>
</body>

</html>